Identifying Students who Accessed Feedback

I leave detailed feedback on assignments that have been uploaded to Canvas. I want to know which students have accessed the feedback and which haven't even bothered to click the 'view feedback' button. This would help me to reach out to students most in need of help and to focus my future comments on students who are actually reading the feedback.

But I'm not sure how to do this, and the new analytics feature doesn't seem to provide a solution.